result when insert

[eluser]UnknownPlayer[/eluser]
Hi,
im new to codeigniter, and i need some help please.
At codeigniter, i have this code:

Code:

$query = "INSERT INTO users
      (username, password, name, email, activation_code)
      VALUES
      (?, ?, ?, ?, ?)";

        $result = $this->db->query($query, array($username, $sha1_password, $name, $email, $activation_code));
        if (!$result) exit();

Do i need this if (!$result) exit();, or codeigniter will exit itself ? ?